<?php
/**
* Zip 文件包工具
*
* @author wengxianhu
* @date 2013-08-05
*/
class ZipFolder
{
  protected $zip;
  protected $root;
  protected $ignored_names;
  public function __construct(){
      $this->zip = new ZipArchive;
    }
    /**
    * 解压zip文件到指定文件夹
    *
    * @access public
    * @param string $zipfile 压缩文件路径
    * @param string $path 压缩包解压到的目标路径
    * @return booleam 解压成功返回 true 否则返回 false
    */
    public function unzip ($zipfile, $path) {
        if ($this->zip->open($zipfile) === true) {
          $file_tmp = @fopen($zipfile, "rb");
          $bin = fread($file_tmp, 15); //只读15字节 各个不同文件类型，头信息不一样。
          fclose($file_tmp);
          /* 只针对zip的压缩包进行处理 */
          if (true === $this->getTypeList($bin))
          {
            $result = $this->zip->extractTo($path);
            $this->zip->close();
            return $result;
          }
        else
          {
            return false;
          }
        }
        return false;
      }
      /**
      * 创建压缩文件
      *
      * @access public
      * @param string $zipfile 将要生成的压缩文件路径
      * @param strng $folder 将要被压缩的文件夹路径
      * @param array $ignored 要忽略的文件列表
      * @return booleam 压缩包生成成功返回true 否则返回 false
      */
      public function zip ($zipfile, $folder, $ignored = null) {
          $this->ignored_names = is_array($ignored) ? $ignored : $ignored ? array($ignored) : array();
          if ($this->zip->open($zipfile, ZIPARCHIVE::CREATE) !== true) {
            throw new Exception("cannot open <$zipfile>\n");
          }
          $folder = substr($folder, -1) == '/' ? substr($folder, 0, strlen($folder)-1) : $folder;
          if(strstr($folder, '/')) {
            $this->root = substr($folder, 0, strrpos($folder, '/')+1);
            $folder = substr($folder, strrpos($folder, '/')+1);
          }
          $this->createZip($folder);
          return $this->zip->close();
        }
        /**
        * 递归添加文件到压缩包
        *
        * @access private
        * @param string $folder 添加到压缩包的文件夹路径
        * @param string $parent 添加到压缩包的文件夹上级路径
        * @return void
        */
        private function createZip ($folder, $parent=null) {
            $full_path = $this->root . $parent . $folder;
            $zip_path = $parent . $folder;
            $this->zip->addEmptyDir($zip_path);
            $dir = new DirectoryIterator($full_path);
            foreach($dir as $file) {
              if(!$file->isDot()) {
                $filename = $file->getFilename();
                if(!in_array($filename, $this->ignored_names)) {
                  if($file->isDir()) {
                    $this->createZip($filename, $zip_path.'/');
                  }else {
                    $this->zip->addFile($full_path.'/'.$filename, $zip_path.'/'.$filename);
                  }
                }
              }
            }
          }
          /**
          * 读取压缩包文件与目录列表
          *
          * @access public
          * @param string $zipfile 压缩包文件
          * @return array 文件与目录列表
          */
          public function fileList($zipfile) {
              $file_dir_list = array();
              $file_list = array();
              if ($this->zip->open($zipfile) == true) {
                for ($i = 0; $i < $this->zip->numFiles; $i++) {
                  $numfiles = $this->zip->getNameIndex($i);
                  if (preg_match('/\/$/i', $numfiles))
                  {
                    $file_dir_list[] = $numfiles;
                  }
                else
                  {
                    $file_list[] = $numfiles;
                  }
                }
              }
              return array('files'=>$file_list, 'dirs'=>$file_dir_list);
            }
            /**
            * 得到文件头与文件类型映射表
            *
            * @author wengxianhu
            * @date 2013-08-10
            * @param $bin string 文件的二进制前一段字符
            * @return boolean
            */
            private function getTypeList ($bin)
              {
                $array = array(
                array("504B0304", "zip")
                );
                foreach ($array as $v)
                {
                  $blen = strlen(pack("H*", $v[0])); //得到文件头标记字节数
                  $tbin = substr($bin, 0, intval($blen)); ///需要比较文件头长度
                  if(strtolower($v[0]) == strtolower(array_shift(unpack("H*", $tbin))))
                  {
                    return true;
                  }
                }
                return false;
              }
            }